Slovenia holds 46km of Adriatic coastline - shorter than a marathon. The three main coastal towns are Koper (the commercial port), Izola, and Piran. Piran is the most photogenic and the most intact: a Venetian-period settlement built on a narrow peninsula, with medieval walls running the perimeter, a Gothic cathedral on the hill, and a central square (Tartinijev Trg) that has not changed substantially in five centuries.
The bus from Ljubljana Bus Station to Piran takes approximately 2 hours 30 minutes by direct service (approximately €12 single); check schedules at ap-ljubljana.si. The Koper--Piran bus service also connects if the direct is not running on your day.
The Ljubljana Marathon runs on 18 October. The Slovenian coast in October is post-season: the summer visitors are gone, most of the larger Portorož hotels are closed or in reduced operation, but Piran's year-round population keeps the town's restaurants, cafés, and accommodation running. The Adriatic in October is approximately 19--21°C - swimmable for those who wish to - and the light on the water in the afternoons is at its most oblique and warm. A better time to visit the coast than any month between June and August.
October on the Slovenian coast: Temperatures 15--20°C by day, cooler in the evenings. Some Portorož facilities closed; Piran itself fully operational.
Night One: Arrival and the Old Town
The bus deposits you at the Piran bus terminal on the western edge of the old town; accommodation is a five to fifteen minute walk on flat ground.
Tartinijev Trg: the central square of Piran, oval in plan, surrounded by a thirteenth-century Venetian Gothic townhouse, a neoclassical theatre, and the 1894 lighthouse. Named after the eighteenth-century violinist and composer Giuseppe Tartini, who was born in a house at the square's eastern corner. The square is one of the most coherent small urban spaces on the Adriatic coast.
Cathedral of St George (Župnijska cerkev Sv Jurija): built on the hill above the town over multiple centuries from the fourteenth. The bell tower offers the view of the peninsula and the Adriatic; the ascent is approximately 100 steps. The church interior has a Baroque main altar and a number of naval ex-votos - small painted panels left by sailors who survived storms at sea, a recurring detail in Adriatic coastal churches.
Piran Town Walls: the medieval defensive walls that ring the upper section of the old town. A circuit of the accessible section takes approximately 40 minutes, with views seaward and landward. The walls are uneven underfoot; walking poles not required but worth noting.
Venetian House (Beneška hiša) on Tartinijev Trg: a Gothic Venetian townhouse from the fourteenth century, distinctive for a decorative relief above the entrance. The building is externally viewable rather than a museum.
Minority Franciscan Monastery (Minoritski samostan) on the waterfront: thirteenth century, with a cloister and a small museum of local paintings and furniture. Entry approximately €3.
Where to stay: Hotel Piran on Stjenkova directly on the seafront - reasonable rooms, excellent position, year-round operation. Max Piran Aparthotel near Tartinijev Trg for self-catering. Guest House Val is a small, family-run option closer to the bus terminal side of the peninsula.
Where to eat: Riva on the seafront promenade serves sea bass, squid, and local seafood at promenade prices that are not unreasonable by comparison with larger tourist coasts. Restaurant Neptun on Župančičeva is slightly inland, slightly less expensive, and equally reliable.
Night Two: Sečovlje Salt Pans and Portorož
The Sečovlje Salina Nature Park is 8km south of Piran at the Slovenian-Croatian border. Bus or taxi (approximately €15) from Piran; the park entrance at Lera is the one containing the salt production museum.
The Sečovlje salt pans have been continuously harvested since the fourteenth century using methods unchanged from the medieval period. The final stage of salt production - raking crystallised salt from the pan surface by hand using wooden tools - still occurs here on a working basis rather than for demonstration. The Museum of Salt-Making explains the process in the former salt-workers' settlement buildings. Entry approximately €8. The pans are also a major bird migration stop; October is a peak period for waders and waterfowl. Allow three hours.
Portorož is 3km north of Piran on the same peninsula - a resort town of large hotels, a casino, and the Slovenian stretch of beach infrastructure. Most of the larger hotels are closed or in minimal operation in October. The seafront promenade and the beach at Portorož are worth the walk for the contrast with Piran's medieval density; the resort as such has little to offer in low season.
Izola (12km north of Piran by bus, approximately 20 minutes) is smaller than Piran and similar in character - a compact Venetian fishing port, fishing fleet in the harbour, fish restaurants on the waterfront. If a second town appeals on day two, Izola is the correct choice over Koper for post-marathon tourism.
Getting Back to Ljubljana
Direct bus from Piran bus terminal to Ljubljana Bus Station; approximately 2 hours 30 minutes; check the Arriva or AP Ljubljana schedules for the afternoon departure. The last direct service is typically mid-to-late afternoon; verify the day before to plan your morning accordingly.